Fixed Camrera related exception.
Aquiring and relesing of camera was not correct.
Added check if face detection is supported.
Merge branch 'VoiceIdentification'
Fixed volume error
Merge remote-tracking branch 'origin/VoiceIdentification'

Conflicts:
	Source/gen/za/co/zebrav/smartdoor/R.java
	Source/src/za/co/zebrav/smartdoor/CameraPreview.java
Merge remote-tracking branch 'origin/master' into VoiceIdentification